function openPopup (url,width,height,scroll)
{
	if (width == null || width==0) { width = screen.availWidth; LeftPosition=screen.availWidth }

	else {LeftPosition = (screen.availWidth) ? (screen.availWidth-width)/2 : 0; }

	if (height == null || height==0) { height = screen.availHeight * 0.8; TopPosition=screen.availHeight * 0.1 }

	else { TopPosition = (screen.availHeight) ? (screen.availHeight-height)/2 : 0; }

	if (scroll == null) { scroll = 'yes'; }

	settings = 'height='+height+',width='+width+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',status,resizable';

	url = url+'?url='+escape(this.location)+'&title='+escape(document.title); 

	win = window.open(url,'',settings);
}